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Philip
Philip Posted on Mar 09, 2019
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Can this be fixed. Everything cleaned up good. Still arcing through the little hole above the waveguide. Microwave around 2 years old. Model peb7226sf1ss. Thanks for any ideas you have.

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CJ Rock

CJ Rock

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  • Master 4,421 Answers
  • Posted on Mar 09, 2019
CJ Rock
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Neither a reasonable repair nor safe for use, IMO.

5 Related Answers

Anonymous

  • 413 Answers
  • Posted on Dec 25, 2008

SOURCE: microwave ovens

The Magnetron has failed, causing the waveguide to become damaged. If the waveguide is damaged/burned the microwave can not be repaired and should be replaced.

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ZZ10952

  • 17 Answers
  • Posted on Feb 08, 2009

SOURCE: Microwave Magnetron tube has arced

REPLCE THE MAG TUBE AND ***

Anonymous

  • 1 Answer
  • Posted on Mar 02, 2009

SOURCE: Microwave waveguide spatter shield burned through

THE PART IS CALLED A WAVEGUIDE COVER AVAILBALE FROM REPAIRCLINIC.COM

MicrowaveSvc

William Miller

  • 9179 Answers
  • Posted on Jul 19, 2009

SOURCE: Sharp R-520LK is arcing.

Quite often this is due to grease or food particles stuck somewhere in the cavity of the oven or stuck on or behind the waveguide cover.

The metal behind it should be cleaned with a mild, non-ammonia cleaner.

If the metal is chipped or charred, the area will first have to be sanded smooth and cleaned and dried thoroughly.

Then you can apply some high-temperature appliance paint, available from places like Wal-Mart, Lowe's or Builder's Square.

 If your waveguide cover is burned or damaged, it will need to be replaced. It provides important protection for the magnetron.

You can order Sharp parts from Encompass here or you can call them toll-free at 866-779-5835.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

Anonymous

  • 619 Answers
  • Posted on Feb 07, 2010

SOURCE: My microwave just started to arc. Is the waveguide

No the wave guide is usually a porous material that almost looks like a light colored cardboard piece. Sound as if the stirrer plate is waht you are seeing. Make sure M/W is clean inside completly. Any build up of grease can cause this. Also make sure to check for chipped areas and if there are use an appliance touch up to cover the bare metal areas. A good cleaning will usually take care of the arcing tho.

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When I use the microwave function on my Miele H64000 HB microwave/ combination oven I get sparks and then smoke inside the oven. I am worried the oven might burst into flames. What should I do?
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Hi. Our 1 1/2 year old Sharp KB6524PS Microwave Drawer: While cooking oatmeal, at start of cycle, the microwave started arcing, then smoking. Shut off at 15 seconds. Microwave-safe china used.
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I have a emerson mw8999rd that started crackling and sparking what cause this and can it be repair?
Sounds bad. Most likley caused by the magnetron tube arcing to the waveguide. Repair may be possible, but would be expensive (more than the microwave is worth). And if the arcing was severe or occurred for more that just 2 or 3 seconds, the waveguide may be damaged, and that is unrepairable.

If you need further help, reach me via phone at https://www.6ya.com/expert/ronald_e6b9572cebe3ad27

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Oct 20, 2014 • Emerson Red Mw8999rd Countertop Microwave
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My microwave arcs every time I try to heat something. The silver colored plate on the interior right side of the cabinet appears to be burned. What happened and can it be fixed?
This arcing is caused by food splatter when something 'popped' or 'exploded' during an earlier cooking cycle. The food particle remained and every time the microwave gets used, this particle continues to cook until it turns into carbon. This can be as small as the tip of a pin. Carbon reacts very violently to RF energy (which is what causes the food to heat). You need to carefully remove the "waveguide cover". Clean it and check for a burned spot. You also need to inspect the inside of the "waveguide" once the cover is off. Clean it also. Make sure there is no grease or other foreign matter inside there and be sure not to leave anything in there (paper towel piece, etc..). If any of the paint inside the waveguide is burned, and if it can't be sanded off and touched up with catalytic paint, you need a new microwave oven. If the burned area is limited to the waveguide cover and you can't find a replacement, you can buy a sheet of mica material from a parts house and use the old cover as a template to make a new one. Also, "If you are on Gilligan's Island" and can't get any new material, you can cut the burned spot out and cover the hole on both sides of the waveguide cover with cellophane tape. Do this at your own risk but usually it works fine.......
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Nov 04, 2013 • Emerson MW8102SS 1100 Watts Microwave Oven
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Microwave when turn on making a noise and sparks comin from fan area?
follow this steps and fix it. God bless you

Waveguide Cover




If the microwave is sparking or arcing the waveguide cover might be damaged and shorting out. Try removing the waveguide cover and see if the problem goes away. If there are any damaged spots in the microwave ceiling or sidewalls, repair them and paint them with microwave oven paint. Replace the waveguide cover if it is burnt or if it will not stay in place.

Microwave Oven Paint




If the microwave is sparking or arcing on the side walls the paint might have chipped causing pitting in the metal oven wall. Use microwave safe paint to touch up any bare metal spots.

Rack Support




If the microwave is sparking or arcing near one of the rack supports, remove the support, repaint any bare metal, install a new support.

2_6_2013_9_27_28_pm.gif

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Feb 06, 2013 • Turbo Air TMW-1100M Green World 1000 Watt...
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The little grey square of something on the right side of the oven got something stuck on it and it ignited. I cleaned off the grey thing and the oven has worked fine for weeks until somehing got stuck...
A "little grey square" may be a waveguide cover. If so, that is where the microwaves come into the cooking area of the unit. Those covers are sensitive to food splatter and moisture..Anything that gets on it will cook and burn and make a hole there. If not being careful when cleaning you can also make hole. If that is what the square is, the waveguide cover will need to be replaced and any arcing behind it or carbon despoisits from the arcing will have to be completely removed before running the unit again. The unit can be run without the cover for testing purposes it only stops food splatter from getting in to the microwave.Microwaves go right through it, l it i not a safety device to prevent leaking. Remove the cover and put a plastic container of water in the unit. Run it to test it. If it arcs, more thorough cleaning and removal of the burn marks is needed. If not replace the cover and you should be good. Only clean those covers with a DAMP cloth, or paper towel. Do NOT soak them or spray them too hard directly.
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Aug 17, 2017 • CDA CM1 Microwave Oven
1helpful
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Sharp R-980A Convection oven - arcing without any metal (except turntable) and smoking inside.
There is a shorted happening when the magnetron release energy. The problem of that is the waveguide already not in focus (already have a big hole on it) hence it scattered the microwave wave elsewhere inside the unit and also to its own metal casing. That cause's to arcing when operating.
Waveguide hole needed to be replace and it need some cleaning & painting of the affected metal (usually near around the magnetron waveguide). Once it's done the unit will not arcing again.
I do hope I answer your problem. Thanks for asking.
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Mar 29, 2011 • Sharp Microwave Ovens
0helpful
1answer

Sparkscome from food (no metal involved) and heating VERY quickly!
Arcing in or above oven chamberThere is often a simple cause:


  • Arcing in the oven chamber with a normal load (a cup of water, for example), often just indicates that a thorough cleaning of the oven chamber is needed, particularly around and inside/above the waveguide cover. Any food that gets trapped here will eventually burn and carbonize resulting in a focal point for further arcing. Usually, the waveguide cover is designed to be removable without taking the (cabinet) cover off of the oven. However, burnt food and carbon often make this difficult so that some disassembly will be required. See the sections: "SAFETY" and "Getting inside a microwave oven".
for more information see "Arcing in or above oven chamber" section of online Microwave Repair Manual.
If the microwave is clean, please post a reply and I will look at it again (this time include a model # and/or approx manufacture date)
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Oct 21, 2010 • GE Spacemaker JVM1640SJ Microwave Oven
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Microwave Magnetron tube has arced
REPLCE THE MAG TUBE AND ***
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Feb 08, 2009 • LG Microwave Ovens
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Takes much longer now to heat things
I think you have two separate problems.

Taking a long time to heat is almost always a failing magnetron.

The cover on the side is the waveguide cover. If your waveguide cover is burned or broken, it will need to be replaced.

It protects the waveguide and magnetron from grewase and food particles, which can cause arcing and damage.

Hopefully your oven is just under the one-year mark and GE will fix it free under warranty.

Otherwise, they will replace the magnetron at no part cost, but labor will be your responsibility.

GE Customer Service is at http://www.geappliances.com/service_and_support/contact/

We're happy to help and we appreciate your thoughtful rating of our answer.
Read full answer
May 10, 2008 • GE Advantium 120 Convection/Microwave Oven
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